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Nu3 Canis Majoris - HD47442 - HIP31700

Nu3 Canis Majoris is a orange to red giant star that can be located in the constellation of CanisMajor. The star can be seen with the naked eye, that is, you don't need a telescope/binoculars to see it.

Nu3 Canis Majoris is the Bayer Classification for the star. HIP31700 is the reference name for the star in the Hipparcos Star Catalogue. The Id of the star in the Henry Draper catalogue is HD47442.

Nu3 Canis Majoris has alternative name(s), 8 Canis Majoris , 8 CMa. Nu3 Canis Majoris is a multiple star system with 2 stars orbiting in its solar system.

Location of Nu3 Canis Majoris

The location of the star in the galaxy is determined by the Right Ascension (R.A.) and Declination (Dec.), these are equivalent to the Longitude and Latitude on the Earth. The Right Ascension is how far expressed in time (hh:mm:ss) the star is along the celestial equator. If the R.A. is positive then its eastwards. The Declination is how far north or south the star is compared to the celestial equator and is expressed in degrees. For Nu3 Canis Majoris, the location is 06h 37m 53.43 and -18d14`14.8 .

Proper Motion of Nu3 Canis Majoris

All stars like planets orbit round a central spot, in the case of planets, its the central star such as the Sun. In the case of a star, its the galactic centre. The constellations that we see today will be different than they were 50,000 years ago or 50,000 years from now. Proper Motion details the movements of these stars and are measured in milliarcseconds. The star is moving -8.72 ± 0.26 miliarcseconds/year towards the north and -7.32 ± 0.43 miliarcseconds/year east if we saw them in the horizon.

Nu3 Canis Majoris Luminosity

Luminosity is the amount of energy that a star pumps out and its relative to the amount that our star, the Sun gives out. The figure of 96.0000000 that I have given is based on the Spectral Types page that I have found on the Internet. You might find a different figure, one that may have been calculated rather than generalised that I have done. The figure is always the amount times the luminosity of the Sun. It is an imprecise figure because of a number of factors including but not limited to whether the star is a variable star and distance.

Physical Properties (Colour, Temperature, Radius) of Nu3 Canis Majoris

Nu3 Canis Majoris has a spectral type of K0II/III. This means the star is a orange to red giant star. The star is 7485.00000000 Parsecs from the Galactic Centre or terms of Light Years is 24413.3262984000000000s. The star has a B-V Colour Index of 1.13 which means the star's temperature has been calculated using information from Morgans @ Uni.edu at being 4,611 Kelvin.

Nu3 Canis Majoris Radius has been calculated as being 27.25 times bigger than the Sun.The Sun's radius is 695,800km, therefore the star's radius is an estimated 18,958,799.75.km. However with the 2007 release of updated Hipparcos files, the radius is now calculated at being round 24.74. The figure is derived at by using the formula from SDSS and has been known to produce widely incorrect figures. The star's Iron Abundance is -0.11 with an error value of 0.04 Fe/H with the Sun has a value of 1 to put it into context.

Nu3 Canis Majoris Apparent and Absolute Magnitudes

Nu3 Canis Majoris has an apparent magnitude of 4.42 which is how bright we see the star from Earth. Apparent Magnitude is also known as Visual Magnitude. If you used the 1997 Parallax value, you would get an absolute magnitude of -1.35 If you used the 2007 Parallax value, you would get an absolute magnitude of -1.14. Magnitude, whether it be apparent/visual or absolute magnitude is measured by a number, the smaller the number, the brighter the Star is. Our own Sun is the brightest star and therefore has the lowest of all magnitudes, -26.74. A faint star will have a high number.

Distance to Nu3 Canis Majoris

Using the original Hipparcos data that was released in 1997, the parallax to the star was given as 7.03 which gave the calculated distance to Nu3 Canis Majoris as 463.96 light years away from Earth or 142.25 parsecs. It would take a spaceship travelling at the speed of light, 463.96 years to get there. We don't have the technology or spaceship that can carry people over that distance yet.

In 2007, Hipparcos data was revised with a new parallax of 7.74 which put Nu3 Canis Majoris at a distance of 421.40 light years or 129.20 parsecs. It should not be taken as though the star is moving closer or further away from us. It is purely that the distance was recalculated.

The star's Galacto-Centric Distance is 7,485.00 Parsecs or 24,413.33 Light Years. The Galacto-Centric Distance is the distance from the star to the Centre of the Galaxy which is Sagittarius A*.

Source of Information

The source of the information if it has a Hip I.D. is from Simbad, the Hipparcos data library based at the University at Strasbourg, France. Hipparcos was a E.S.A. satellite operation launched in 1989 for four years. The items in red are values that I've calculated so they could well be wrong. Information regarding Metallicity and/or Mass is from the E.U. Exoplanets. The information was obtained as of 12th Feb 2017.

Nu3 Canis Majoris Facts

Alternative Names

Short Name8 CMa
Bayer DesignationNu3 Canis Majoris
Alternative Name(s)8 Canis Majoris
Hipparcos Library I.D.31700
Bonner DurchmusterungBDD-18 1492
Henry Draper Designation47442

Visual Facts

Star Typegiant star
Absolute Magnitude-1.35 / -1.14
Visual / Apparent Magnitude4.42
Naked Eye VisibleYes - Ref: Wiki
Right Ascension (R.A.)06h 37m 53.43
Declination (Dec.)-18d14`14.8
Galactic Latitude-11.11 degrees
Galactic Longitude227.87 degrees
1997 Distance from Earth7.03 Parallax (milliarcseconds)
 463.96 Light Years
 142.25 Parsecs
2007 Revised Distance from Earth7.74 Parallax (milliarcseconds)
 421.40 Light Years
 129.20 Parsecs
Galacto-Centric Distance24,413.33 Light Years / 7,485.00 Parsecs
Proper Motion Dec.-8.72 ± 0.26 milliarcseconds/year
Proper Motion RA.-7.32 ± 0.43 milliarcseconds/year
B-V Index1.13
Radial Velocity-1.50 ± 0.70 km/s
Iron Abundance-0.11 ± 0.04 Fe/H
Spectral TypeK0II/III
Colour(K) Orange to Red
Stars in Solar System2

Estimated Facts

Luminosity (x the Sun)96.0000000
Calculated Effective Temperature4,611 Kelvin

Sources and Links

SIMBAD SourceLink

Related Stars

Multi-Star System

The star has been identified as being a multi-star system, one in which there is at least one star in close orbit to another star or two or more stars orbiting a central point. The stars may be of equal mass, unequal mass where one star is stronger than the other or be in groups orbiting a central point which doesn't necessarily have to be a star. More information can be found on my dedicated multiple star systems page. The source of the info is Simbad. The file is dated 2000 so any differences between this and any other source will be down to the actual source from where the information came from.


Proper Motion mas/yr
H.D. IdB.D. IdStar CodeMagnitudeR.A.Dec.SpectrumColourYear
47442-18 1492.0A4.60000-7.00000-8.00000K0Orange
B8.60000-7.00000-8.000001991

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